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论文类型：期刊论文

发表时间：2015-09-15

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：93

页面范围：973-982

ISSN号：0950-0618

关键字：Dam concrete; Site-casting; One-time pouring; Fracture parameters; Minimum specimen size

摘要：This paper presents the minimum specimen size for experimental determination of the fracture parameters of site-casting dam concrete. Five series of wedge-splitting specimens for dam concrete with maximum aggregate size of 150 mm were tested, casting in the site of an actual super-high arch dam with its mixing tower system. The complete load-crack mouth opening displacement and load-crack tip opening displacement curves of the specimens were acquired. The fracture parameters, including fracture energy, effective fracture toughness, and critical crack tip opening displacement, were also obtained. Furthermore, the effect of specimen size on fracture parameters was discussed, and it was found that the minimum specimen size for determining the independent fracture parameters of the site-casting dam concrete should satisfy that ligament length is six times larger than the maximum aggregate size. (C) 2015 Elsevier Ltd. All rights reserved.